fun3=@(x,y,z)z.^2*log(x.^2+y.^2+z.^2+1)./(x.^2+y.^2+z.^2+1).*(z>=0 &... 
    z<=sqrt(1-x.^2-y.^2));  %该语句使用了续行符...
I=triplequad(fun3,-1,1,-1,1,0,1)
